body {
  margin: 0;
  display: flex;
}

#app {
  flex: 1;
  display: flex;
  height: 100vh;
}

#root {
  flex: 1;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
}


#dev {
  flex: 0 0 400px;
  display: flex;
  height: 100vh;
}

#dev-root {
  flex: 1;
}

.hello {
  flex: 1;
  overflow: auto;
}

.hello-wrap {
  width: 600px;
  margin: 10px auto;
}

.todo-list {
  list-style: none;
  font-size: 24px;
  line-height: 30px;
  margin: 0;
  padding-left: 0;
}

.todo-item {
  margin-bottom: 10px;
  padding: 10px 15px;
  cursor: pointer;
  background-color: #F0F0F0;
}

.todo-item:last-child {
  margin-bottom: 0;
}

.todo-item.completed {
  background-color: yellowgreen;
}

.todo-item span {
  user-select: none;
}

.top-bar {
  text-align: center;
  font-size: 16px;
  line-height: 22px;
  margin-bottom: 10px;
  padding: 14px 15px;
  color: #F0F0F0;
  background-color: seagreen;
  position: relative;
}

.counter {
  font-size: 16px;
  line-height: 22px;
  margin-top: 10px;
  padding: 14px 15px;
  color: #F0F0F0;
  background-color: darkcyan;
  position: relative;
}

.counter button {
  margin-top: 0;
  margin-bottom: 0;
  border: 0;
  background-color: white;
  margin-right: 14px;
}

.bottom-bar {
  font-size: 16px;
  line-height: 22px;
  margin-top: 10px;
  padding: 14px 15px;
  color: #F0F0F0;
  background-color: darkslateblue;
  position: relative;
}

.bottom-bar span {
  margin-right: 14px;
}